This application relates to a containment band for holding a plurality of resistors which are part of a slip ring in a testing system.
Many components must be tested after manufacture. Some components are subject to rotation at speeds that will approximate their rotational speed and use.
Sensors, such as strain gauges, may be mounted to sense stresses and strains in the component, such as during high speed rotation. These signals must be sent to a controller, which may be static.
A so-called slip ring is often utilized to communicate rotating electric transmission systems to a static control. One known type of slip ring includes a resistor bridge associated with a rotating part of the slip ring. This resistor bridge will rotate at high speed along with the rotating component.
A slip ring has a rotating portion configured to take in signals from rotating electric transmission elements, and communicate those signals into a static portion. The rotating portion has a plurality of resistors which rotate. The resistors have an outer peripheral surface, and a containment ring surrounding the outer peripheral surface of the plurality of resistors. A method of testing a rotating component is also disclosed.
These and other features may be best understood from the following drawings and specification.
Strain gauges 27 are associated with the component 22 and communicate to a slip ring 28. As known, a slip ring has a rotating portion 29 that takes signals in from rotating electric transmission members and communicates them to a static portion 30. The signals then pass to a control 32
System 20 may operate by having motor 26 drive member 24 to drive the component 22.
As shown, the test system 120 may include a wind tunnel 118 for driving air towards the propeller 123. Gauges 127 are mounted on the propeller, and communicate to a rotating portion 129 of a slip ring, which in turn communicates to a static portion 130 mounted on the housing 132 of the ram air turbine. Static portion 130 communicates signals to a control 131.
The system, with a wind tunnel, could also be utilized to test the ram air turbine 122 while it is actually mounted on an aircraft.
This rotation may be at very high speeds, for example on the order of 4500 rpm. Of course, other speeds would come within the scope of this disclosure. During this rotation, the gauges 27 monitor the stresses and strains within the component 22 and communicate signals through slip ring 30 and to control 32.
As shown in
A containment ring or band 40 is formed about the resistors 38 to contain them during high speed rotation.
As shown in
A second embodiment 60 is illustrated in
As shown in
In embodiments, the resistors may bonded to the band 40 using a potting compound, such as Dolph Motor Potting Compound.
Although an embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.